Nonlinear free vibration of stiffened plate with four edges clamped
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摘要: 针对工程中常用的加劲板, 研究了非线性振动的求解方法与振动特性. 将加劲板分为板与加劲肋两个部分考虑, 其中板视为考虑几何非线性的大挠度板, 加劲肋视为Euler梁. 假定加劲板的位移, 利用Lagrange方程结合系统能量和振型叠加推导了加劲板的动力平衡方程. 运用椭圆函数及摄动法计算加劲板非线性振动的单模态解, 多模态解则通过增量迭代法进行求解. 最后, 结合有限元软件ANSYS对一个四边固定且不可移动的加劲板进行分析, 讨论解的收敛性, 并分析两个方向设置不同数量加劲肋的情况下非线性自振频率与振幅的关系, 得到了一些加劲板非线性振动特性.
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关键词:
- Lagrange方程
Abstract: One approach is presented to study the nonlinear freevibration characteristic of stiffened plates. The stiffened plate is dividedinto plate and stiffeners. The plate is considered to be geometricallynonlinear, and the stiffeners are taken as Euler beams. Assuming thedisplacement of the stiffened plate, Lagrange equation and modalsuperposition method are used to derive the dynamic equilibrium equations ofthe stiffened plate according to energy of the system. The single-moderesults are obtained through Elliptic function and the perturbation method,and the multimode results are obtained through incremental-iterativemethods. At last, a stiffened plate with four immovable clamped edges isstudied through both the present approach and FE software ANSYS. Theconvergence of solution is analyzed, and the relationship between nonlinearnatural frequency and its amplitude is discussed when the number ofstiffeners in the two direction is different. Some nonlinear vibrationcharacteristics of stiffened plate are obtained, which can providereferences for engineering design.-
Key words:
- Lagrange equation
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